<!DOCTYPE html>
<body>
  <div style="display: inline-block; background: blue;
              height: 40px;
              border: 80px transparent solid">
    <!-- We need to be shorter than intrinsic height, so use a max-height -->
    <img src="lime100x100.png"
         style="max-height: 100%; display: block; visibility: hidden;">
  </div>
</body>
